843321449 has 2 divisors, whose sum is σ = 843321450. Its totient is φ = 843321448.

The previous prime is 843321439. The next prime is 843321541. The reversal of 843321449 is 944123348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 791409424 + 51912025 = 28132^2 + 7205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-843321449 is a prime.

It is a super-2 number, since 2×843321449² = 1422382132686919202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (843321439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421660724 + 421660725.

It is an arithmetic number, because the mean of its divisors is an integer number (421660725).

Almost surely, 2^843321449 is an apocalyptic number.

It is an amenable number.

843321449 is a deficient number, since it is larger than the sum of its proper divisors (1).

843321449 is an equidigital number, since it uses as much as digits as its factorization.

843321449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 38.

The square root of 843321449 is about 29039.9974001376. The cubic root of 843321449 is about 944.7807779794.

The spelling of 843321449 in words is "eight hundred forty-three million, three hundred twenty-one thousand, four hundred forty-nine".